Combined trip and throttle valve.



P. KNAUP.

COMBINED TRIP AND THROTTLE VALVE.

SHEET 1.

I N VE N TOR 6. Aug.

2 SHEETS Patents awvrd APELIGA'TION FILED MAY 14, 1912.

A TTORNEY 3. W. KNAUF. COMBINED TRIP AND THROTTLE VALVE.

APPLICATION FILED MAY 14, 1912.

' Patented Aug. 5, 1913.

M P5 w A M w- AZwAwZ BY %J@ WP many ATTORNEY INVENTOR UNETED STATESPATENT @FFIQE PAUL W. KNAUF, 0F CYNWYD, PENNSYLVANIA, ASSIGNOR TOSCHU'ITE & KOERTING COMPANY, OF PHILADELPHIA, PENNSYLVANIA, ACORPORATION OF PENNSYL- VANIA.

incense.

Specification of Letters Patent.

COMBINED TRIF AND THROTTLE VALVE,

Patented Au .5,1913;

To all whom it may concern lie it known that 1. PAUL W. KNAUF, a citizenof the Unitei. States of America, residing in ('yi'iwyd, county ofMontgomery, in the State of Pennsylvania, have invented a ccit'ain newand useful lmprovernent in Combined Trip and Throttle Valves, of whichthe following is a true and exact description, reference being had tothe accompanying drawings, which form a part thereof.

My present invention relatesto trip valves and particularly to acombined trip and throttle valve adapted to be operated through a nutand screw in normal operation and when tripped to close automatb callyand independently of the nut and screw.

The general object of the invention is to provide an improved valve ofthe kind referred to.

One specific object of my invention is to provide such a valve withelectromagnetic tripping means of desirable form, and a further objectof the invention is to combine this electromagnetic tripping mechanism.

embodying my invention. Fig". '2 is an-end' elevation ot'the valve shownin Fig. .l. Fig. 3 is a diagrammatic representation of circultconnections for the electromagnetic trippingmechanism of the valve shownby l ie's. .i and 2. Fig.4 is an elevation of a portion of a modifiedform of valve mechanism realm-dying my inventioi'i. Fig. 5 is an endelevation of a portion of the mechanism shown in Fig. 4- and" Fig. (3 i.a diagrammatic representation of circuit connections for theelectromagnetic tripping mechanism shown in Fig. 4,

In the drawings and referring first to the construction shown in Figs. 1and 2, A represents the valve easing body having inlet;- and outletcompartments connected by the valve sleated port A. The latter iscontrolled by the horizontally movable valve member B. As shown thevalve member B i is formed with a piston. extension B working in abalancing chamber A located in the inlet compartment of the valve casingand connected with said compartment by a restricted passage or passages.The chamber A is adapted to be connected with the outlet compartment ofthe valve casing through the port B formed in the valve member li andcontrolled by the pilot valve t. The latter is connected to an operatingstem 1) projecting through the casing wall at one side of the valve andto a second stein portion 15 projecting through the wall of the valvecasing at the opposite side of"?- the valve. The stem E is provided witha, piston enlargement E of larger cross sec-- tion than the stem D. Thepilot valve and main valve are connected so that the pilot valve mayhave a restricted movement with respect to the main valve sntticient .toclose and open the port B .By virtue of the features of constructionreferred to, the main -'alve is substantially balanced when open,

but the greater cross sectional area of the piston enlargement E incomparison with the cross sectional area of the stem D gives the movablevalve mechanism as a whole, a tendency to move into the closed position.The casing body A is formed at one side with an aperture normally closedby the bonnet member F. The latter is provided with a suitable stallingbox t'or preventing leakage along the valve stem 1), which passesthrough the body of the member F. The bonnet member F is formed witharms F integrally connected at. their outer ends by a tubular portion Fwhich forms a guide sleeve to a sliding nut G screwed on to thethreadedportion D of the valve stem D.

At its outer end the valve stem carries an operating wheel or handle DThe sliding nut. G is connected to the bonnet ,by a link connect-ionconsisting of a bell crank lever ll fulcrumed at H to the bonnet memberF, and having the free end of one arm pivotally connected as by the pin"l' to a link member I. The other end of the link member I is pivotallyconnected, as by the pin P, to the outer end of the sliding nut G.

pivot pins 1 and P, as shown, are both loe ted above the stemlT'and sothat when the rod G is in its outermost position, the axis of the pivotpin' l passes slightly below the plane includin the axes oi the pivotpins I and I sb-fihiit the'inward thrust of the rod G tehds' to lock thelever and link in a rigid position owing. to the engagement of the leverH with the outer end of the bonnet sleeve portiori"h In this conditionof the apparatus the valvemay be opened, wholly or art-1y, and closed"ll's desired by rotating the l iand wheel D so long as the partsoccupythe position shown in Fig. 1. When the bell crank lever H is turned asit may be manually through the lever TH secured to the lever to move thepivotal connection I above the plane including the axes of the pivotalconnections I and I, the linked connection between the" sliding nut andthe bonnet isfiee to collapse and the .valve theIrel6sesautomaticallyunder the loadingiififce'diie, in' the form of valve mechanismisjelosed, to the unbalanced action of theflurdrpressure withdrops thusrestoring the locked condition- "of the link connection and the valvemay then be opened as desired by the wheel, To

. permit of the tripping of the valvefrom a.

distance and through emergency means, I

have provided an electromagnetic tripping mechanism which is supportedonthe valve casingbonriet asby means of a pair of bolts J passingthrbughand secured in the aperturesiF'" of the bonnet F. a As shown, the

upper end of the bolts support a cross head Kfl ivhich' forms the lowerend portion of thef core of an .electromagnet K?. The 'upper; endportion of the magnet core is connected to the lower portion by thecentral core portion surrounded by the Winding of ,the electromagnetlThe armature of the elet tromagnet is in the form"'of an arm L formed ofmagnetic material ,and pivotally connected at K} to the member 'K. Theari'hhturc arm L is formed a't'its free end with cylindrical enlargementL'. In the normal condition of the apparatus shown ,in

i full lines in Figl l the enlargement L] con .tacts with the iipper endmember K of the .fio electromagnet core and is retained in this I 1position by..m'agnetic attraction, the windmg of the electromagnet beingnormally .fenergized. The parts areso proportioned and arranged however,that 'whei 'the electromagnet K is dce'nergized, thfnrniature -L willswing down into the dotted line position shown inFig. 1. As the heavyfree 'e11g.lL of the armature L nears the posithe magnetic forcerequired to ,hold it in place may be comparatively small.

It will be apparent, of course, that various 'forms of circuitconnections may be employed to control the energization anddeenergization ofthe electromagnet K either manually "or shtomati cally.In the arrange ment for this purpose shown, in Fig. 3, K and K representconductors connected to the terminals of the winding of the magnet K. Abattery M coniiected between the conducto'rs K and K provides theenergizing" current for the electron'iagnet. N represents a switch whichmay be located at any convenient place andwzriich when closed forms *alow resistance shunt about the battery Ni and thereby effectivelyde'e'nergizes the magnet ,K. In Fig. 3 OQ-and O represent nor-' manyopen swi tch contacts adapted to be closed by a speed governor. P. andthen closed to short circuit the battery .just ais theswitch does whenit is closed. The governocPas shown, comprises a shatt P which may bedriven for instance by Eli engine supplied with steam passing throughthe valve shown In Fig. l and Fig. 2. The

shaft P Which-is hollow has axially mounted in it a sliding pin P Thepinl? is connected with a sliding li'ollar P by the" join- 1 adaichpasses through a.'sl0t P y formed in the hollow shaft P. The Sliding 11ocollar Pflis connected 'byarms 1 and weights or ballsiP" to a secondbollar I secured to the shaft P. Y lVith this arrange-Q ment, whentheshaft P attains a pre 0- termined speed of rotation the outward throw ofthe weights P and the consequent axial movement of the collar P causesthesliding pin'P to 'force the switch contact 0 into engagement with thecontact 0.

This de'ene-rgizes the electromagnetK and trips the valve mechanism ashcrcinhefore described. Tn the modified form of apparatus illustrated inFigs. 4, 5 and 6, the valve mecha- I 'nism proper is shown asbGll'lgldGnl-lCfll with that shown in Figs. 1 and 2. The modified formof tripping mechanism shown in Figs. fl, 5 and 6 comprises a support Lsecured to the posts J. adjacent their upper ends.

-' To the support L ispivoted a member. LA 13% which-may be practicallysimilar in iorm to the member'L first described. As shown in Figs. e, 5andiG. however, the free end of the member LA is adapted to have itscenter of gravity swing over the axis of the pivotal connection Lbetween the support L and the member LA as the arm approaches and leavesits normal position shown in full lines in Fig. 4. L represents a screwadjustably secured to the member LA and adapted to engage :1 lug- Lcarried by the support L". A crosshead K secured to the upper ends ofthe post It forms the base of a pair of electromagnets Kill. This crosshead is formed with bracketiarms K in which is pivoted a lever Pr Thelatter forms in effect a pivoted armature for the electromagnet-KA. Thelever armature R is provided with a camming projection R adapted toengage the cylindrical enlargement L of the member LA and move thecenter of gravity of the latter over the dead center line when-themagnets KA are deenergized. S represents a counter weight adjustablysecured to the lever B so that the latter, while normally held bygravity in the position shown by Fi 1. may-be nearly balanced. VJith-thedevices S and L it is possible to adjust the apparatus that thememberiLA may" be cammed over the dead center lineby a comparativelysmall force. To facilitate the return of the swinging arm LA to itsnormal position and to avoid all possibility ofthe' weight beingaccidentally thrown out of itsnormal position by vibrm.

tion Iprefer to provide the lever B with 4 an arm R :terminatingin ahook R which is adapted toengage a tooth L carried by the arm ILA-whenthe magnets KA are deenergized. As shown, the back of the hook R -isbeveled so that the hook does not tend to prevent the return oif memberLA into its normal position. r

In :the diagrammatic representation of circuit connections shown in Fig.6, I 15 and K represent the conductors connected to the terminals of thewindings of the electromagnets EA, The battery M or other source ofcurrent is shown as connected in series in one of these conductors. Nrepresents a switch adapted to be manually actuated to close theenergizing circuit for the magnets :KA, and U and 0 represent switchcontactscontrolled by a speed governor P as in Fig. The switch contacts0 and 6 when brought together also close the energizing circuit 01 themagnet.

The electromagnet tripping mechanism shown in Figs. 1.2 and is somewhatsimpler than that shown by Figs. 4 5 and (i but requires the magnet K tobe normally energized. l/Vith the tripping arranr'ement shown in Figs.4,.5 and 0 however, the magnets KA. are normally deiinergiaed. Witheither form of apparatus disclosed the valve proper and its trimmingmechanism other than the circuit closing provisions are united in asimple compact self-contained structure in which the linked connectionbetween the valve casing; and sliding nut fall by gravity into thelocking: positionon the proper manipulation of the hand wheel after anemergency closing of the valvr )winr to the manner in which electromagnetic tripping means are disposed the magnetic force required to holdthe falling in its elevated position or to force it out of said positioniscomparatively slight. As the fulcrum ot' the lever H fixed the forceof the blow imparted to it by the fallim: weight does not depend on theextent to which the valve is open when the valve is tripped.

While in accordance with the provisions of the statutes I haveillustrated and described the best forms of my invention now known to meit will be apparent to those skilled in the art that changes may be madein the form of apparatus disclosed without departing from the spirit ofmy invention. and that incertain cases some features of the mechanismmay be used with advantage without a corresponding use of otherfeaidres.

Having now described my invention what I claim as new and desire tosecure by Letters Patent is,

1. In a combined trip and throttle valve mechanism, the combination withthe valve casing, of a horizontally movable valve mounted therein andhaving a stem projecting through the wall of said. CRSlnQ, said valvebeing unbalanced with a tendency to close, a nut inthreaded engagementwith said stem :1 collapsible connection between the casing: and saidnut. comprising a pair of members united by a pivotal connection andpivotally connected. one to said casing and the other to said not andprovisions for arresting the downward movement of said pivotalconnectlon at a point slightly below the plane including the axes ot thepivotal connections between said members and the casino" and nut. andtripping: means adaptsaid stem. a collapsible connection between I thecasing and said nut comprising a pair of members united bynapivotalconnection and pivotally connected one to said casing and theother to said nutand provisions for arresting the downward movement orsaid ing, a link united to one arm of sa d lever pivotal connection at apbint slightly below a the plane including" the axes of thepivotalconnections between said membersmnd the casing and nut, a weight adaptedto fall close, a nut in threaded engagement with said stem, acollapsible connection between the casing and said nut, comprising atwoarmed lever pivot-ally connected to said casiolding' said weight insaid ele-.

l by a pivotal connection and pivotally con-.

nected to said nut and provisions for arresting the down ward movementof said pivotal connection at a point slightly below the -planes,including the axes of the pivotal connections between the lever andcasing and thelink and nut, a weight plvoted to said casing and adaptedto swing downward from an elevated position into engagement with thesecond arm of said lever and 1mpart a blow thereto ell'cctiue' to movesaid 'piv'otal connection upward above Sfl1Clpl:Il10, and means forreleasably holding said weight in said elevated position.

4. In a combined trip and throttle valve mechanism, the combination witha valve casing of a valve mounted therein and having a stem projectingthrough the wall of i said casing, said valve being unbalanced with atendency to close, a llllt'lll threaded engagement. with said stem, acollapsible I 7 connection between the casing and. said nut,

comprising a bell crank lever pivotally connected to said casing, a linkunited to one arm of said lever by a pivotal connection and pivotallyconnected to' said nut and provisions for-arresting the movement ofsaidv pivotal connection in one direction away from the plane includingthe axes of the pivotal coimections between said lever and ca ing andlink and nut at a point closely adjacent said plane, and means for:ausing said pivotal connection to move from said point to the otherside of said plane to thereby permit said connection to collapse,comprising a. weight pivoted to said casing and adapted to swing downfrom an elevated position into engagement with the sem'md arm of saidlever member and thereby impart'a blow to the latter, and means forreleasably holding said weightin said elevated position. A,

5. In a combined trip and tl'vi'ottle valve mechanism, the ,combinationwith casing ,gized to retain said arm in its elevated pos axis andadapted when permitted to fall from an elevated position to engage saidconnection and bring about its collapse and an electromagnet supportedfrom said cas ing and adapted to releasably retain said arm in itselevated position.

6. In a combined trip and throttle valve mechanism, the combination withthe easing and the valve, of operating means for the latter including acollapsible connection and provisions for automatically closing thevalve when said connection collapses, means for. bringing about thecollapse of said connection comprising a weighted arm pivoted tosaidcasing to turn about a horizontal axis and adapted when permitted tofall from an elevated position to engage said connection and bring abouti collapse and an. electromagnet supporte from said casing and adaptedwhen ene tion by magnetic attraction.

7. In a combined trip and throttle mechanism, the combination with avalve casing: comprising a body and a bonnet provided with a yoke, ofajvalve having a stem projecting through said casing, a nutin threadedengagement with said stem and slidingly mounted in said yoke, supportssecured to said yoke, a weightedarm pivotally connected to saidsupp0rts, an electromagnetic device mounted on said supports,rmreleasably holding said arm. in an elevated position from which saidarm swings downward when released, and acollapsible. connection betweensaid casing and said nut adapted to be struck and collapsed by said armwhen the latter swings downward 8. In a combined trip and throttle niechanism, the combination with a valve casin comprising a body and a-bonnetprovided with a yoke, of a horizontally movable valve I having a stemprojecting through said casing, a nut in threaded engagement with saidstem and mounted in said yoke, vert1cal supports secured to said joke, aweighted arm pivotally connected to said supports, an electromagneticdevice mounted on said supports for releasably holding said arm with itscenter of gravity above and slightly at one side of the vertical planepassing through said axis whereby said arm will swing downward whenreleased, and a collapsible connection between said casing and 'said nutada ted to be struck and colarm when tlte latter swings anism, thecombination with a valve casing leasably holding said arm in an elevatedvomprising a body and a bonnet provided position from which said armswings down- With a yoke, of a horizontally movable valve Ward whenreleased, and a vollapsible conhaving a stem projecting through saidoasneotion between said casing and said nut 5 ing, a nut in threadedengagement with l adapted to be struck and collapsed by said 15 saidstem and slidingly mounted in said arm when the latter swings downward.

yoke, vertical posts secured at their lower PAUL V. KNAUF. ends to saidyoke, a Weighted arm pivotally. \Vitn'esses: connected to said supports,an elect-romag- A. FIsoHER,

10 netic device mounted on said posts for re- SIMON WV. SNYDER.

